Vinegar is a staple in most kitchen pantries most often used to make pickles or combined with oil for flavorful vinaigrette salad dressing.
Oven cleaner to remove paint from brick.
Strip paint or varnish.
Spray paint is notoriously difficult to remove from porous surfaces like brick mortar and concrete.
But honestly if no one has ever tried oven cleaner on paint try it.
There are several methods to clean fireplace brick but one of the easiest and most effective is to use oven cleaner.
Do test a small spot before using on the entire brick surface.
Just for the heck of it if you have oven cleaning in the spray can it removes most paint very quickly and well even in the little grooves also but like in sand blasting be carefule but 2 to 3 thousand psi pressure washer using about a 15 degree tip may also have some luck.
The fix usually depends on what kind of masonry you re cleaning and the type of paint used but when you use a product specifically designed to remove graffiti things get much easier.
I normally use actual stripper in a can its a compressed foam that i get from home depot for small projects or i like to use aircraft stripper which comes in a larger metal can similar to paint thinner.
However if you re limiting vinegar to the kitchen you re missing out on hundreds of household uses.
Before applying a stripping agent to remove paint from brick test the stripper on an inconspicuous part of the installation.
It costs less than commercial paint strippers and is easier to.
Vinegar is an easy inexpensive and effective way to remove dried stuck on paint from windows and other hard surfaces.
Which method you use to remove dried paint from brick will depend on the type of paint stain and how much elbow grease you re willing to invest.
Oven cleaner is designed to remove scorched and baked on debris.
Be sure there is no fire in the fireplace when spraying the oven cleaner as the can is under pressure.
For an easy way to remove paint or varnish from wooden or metal furniture try using a can of oven cleaner.